package com.hmdp.utils;

import lombok.Data;
import lombok.RequiredArgsConstructor;
import org.springframework.core.io.ClassPathResource;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;
import org.springframework.data.redis.core.script.RedisScript;
import org.springframework.stereotype.Component;

import java.util.Collections;
import java.util.UUID;
import java.util.concurrent.TimeUnit;


@RequiredArgsConstructor
public class SimpleRedisLock implements ILock{
    private final String name;
    private final StringRedisTemplate stringRedisTemplate;
    private final String KEY_PREFIX="lock:";
    private final String ID_PREFIX= UUID.randomUUID().toString();
    private static final DefaultRedisScript<Long> UNLOCK_SCRIPT;
    static{
        UNLOCK_SCRIPT=new DefaultRedisScript<>();
        UNLOCK_SCRIPT.setLocation(new ClassPathResource("unlock.lua"));
        UNLOCK_SCRIPT.setResultType(Long.class);
    }

    @Override
    public boolean tryLock(long timeoutSec) {
        //获取线程标识
        String threadId = ID_PREFIX+Thread.currentThread().getId();
        //获取锁
        Boolean success = stringRedisTemplate.opsForValue()
                .setIfAbsent(KEY_PREFIX+name, threadId , timeoutSec, TimeUnit.SECONDS);
        return Boolean.TRUE.equals(success);
    }

//    @Override
//    public void unLock() {
//        //获取标识判断是否一致
//        String threadId = ID_PREFIX+Thread.currentThread().getId();
//        String id = stringRedisTemplate.opsForValue().get(KEY_PREFIX + name);
//        if (threadId.equals(id)) {
//            stringRedisTemplate.delete(KEY_PREFIX+name);
//        }
//        stringRedisTemplate.delete(KEY_PREFIX+name);
//    }


    @Override
    public void unLock() {
        //调用lua脚本
        stringRedisTemplate.execute(
                UNLOCK_SCRIPT,
                Collections.singletonList(KEY_PREFIX+name),
                ID_PREFIX+Thread.currentThread().getId()
                );
    }
}
